[tex]\Large {\mathbf{Ecuación \: de \: Primer \: grado : }} \\ \Large {\mathbf{8x - 20 = 2x + 40 }}\\ \Large {\mathbf{8x - 2x = 40 + 20 }}\\ \Large {\mathbf{6x = 60}} \\ \Large{\mathbf{ x = \frac{60}{6} }} \\ \Large{\mathbf{ x = 10 }}\\ \\ \Large {\mathbf{Comprobamos: }} \\ \Large {\mathbf{8x - 20 = 2x + 40}} \\ \Large {\mathbf{8(10) - 20 = 2(10) + 40}} \\\Large {\mathbf{ 80 - 20 = 20 + 40 }}\\ \Large {\mathbf{60 = 60 }}\\ \\ de \: nada \: [/tex]
